KR100222881B1 - Control method and device for the amount of fuel at engine starting - Google Patents

Abstract

The present invention relates to a fuel injection control system for an automotive vehicle, in which, when a request for restarting is detected in a state in which a normal start of the engine is not performed in response to a start request of the engine in a cooled state, So that the concentration of the exhaust gas by the excessive mixture is stabilized at the start.

The present invention relates to a method of controlling an internal combustion engine, comprising the steps of simultaneously injecting a calculated amount of fuel when a request for starting a cooled engine is detected, sequentially advancing a correction injection to a cylinder side that is compressed by cranking, Executing fuel injection of the stoichiometric air-fuel ratio when the cooling water temperature, the rotational speed of the crankshaft, and the voltage of the battery are determined to be maintained at the normal RPM, and if the engine is not in the normal ignition state, Determining whether or not a re-start request is detected; calculating a remaining amount of fuel that is burned by compression explosion of cranking after being injected into a cylinder in a start request of the previous state when a restart request of the engine is detected; Calculating a fuel amount to be injected in response to a request for restarting from the remaining fuel amount of the cylinder, To suppress the exhaust of the exhaust gas due to incomplete combustion at the time of engine startup, and to prevent the cylinder from over-explosion, thereby improving the durability of the cylinder and the piston.

Description

Method and apparatus for controlling fuel injection quantity at engine start

FIG. 1 is a block diagram of the configuration of an injection fuel quantity control apparatus according to the present invention.

FIG. 2 is a flow chart of an embodiment for performing injection fuel quantity control at engine start according to the present invention; FIG.

FIG. 3 is a timing diagram for adjusting the amount of fuel injected from a typical automobile.

[Industrial Applications]

The present invention relates to a fuel injection control apparatus for an automobile. More particularly, the present invention relates to a fuel injection control apparatus for an automobile, and more particularly, And the exhaust gas concentration is stabilized by eliminating incomplete combustion by an excessive mixture at the start of the engine.

[0003]

Generally, when the ignition switch is initialized and the ignition system is initialized, when the contact of the ignition switch is selected as the contact of the ignition switch to start the engine, the control means sets the signal applied through the contact of the ignition switch to the set program And proceeds the overall operation for turning on the engine.

At this time, when the ignition switch contact is turned on, the injector is opened by the power source applied from the battery and the stability of the starting is maintained by increasing the ratio of the mixer per unit volume of each cylinder as shown in FIG. A predetermined amount of fuel calculated according to the injection program set for the lubrication action inside the injector and the cylinder is simultaneously injected and the start motor is driven to rotate the crankshaft so that any cylinder reaches the top dead center, Any spark plug that is applied to the high voltage of the ignition device causes a spark discharge to explode the mixer of the compressed cylinder to induce the driving of the engine.

At this time, when normal ignition of the engine is performed, the control means detects the rotational speed of the crankshaft, adjusts the spraying period of the injector corresponding to the rotational speed of the crankshaft, attenuates the amount of fuel injected to each cylinder side, And when the voltage level of the battery is detected as a normal level, it is determined that the engine is in a normal state of ignition, and the amount of fuel injected to each cylinder side is corrected and controlled.

If a request for starting by ignition of the ignition switch contact is detected in a state in which the ignition of the engine is not performed, the injector is opened by a power source supplied from the battery, and the predetermined amount And the start motor is driven to rotate the crankshaft to reach the top dead center. When compression is performed, any spark plug applied to the high voltage of the ignition device causes spark discharge, To drive the engine.

[Problems to be solved by the present invention]

In the conventional automobile as described above, the fuel amount set in accordance with the startup program is simultaneously injected to each cylinder side in response to the initial startup request of the engine in a cooled state, and even after the injection of the injector is corrected according to the rotation of the crankshaft, The control means executes the simultaneous injection of the fuel amount set in accordance with the startup program, and each injector executes the correction injection according to the compression stroke of the piston through the crankshaft, so that when the ignition of the engine is performed, There is a problem in that incomplete combustion occurs due to a large mixing ratio in the exhaust gas of the engine, thereby causing smoke to be generated and destroying the environment, and the consumption of fuel is promoted due to frequent injection of unnecessary amount of fuel.

In addition, due to the frequent injection of fuel, the fuel injected into the spark plug is absorbed, knocking occurs during spark discharge for ignition to deteriorate the stability of the starting, and excessively sucked and explosive force is formed due to fuel explosion, .

[Purpose for solving the problem]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of controlling the opening and closing degree of a nozzle of an injector when a request for restarting is detected in a state in which an engine is not ignited, The concentration of the exhaust gas is stably maintained by eliminating the formation of the excessive mixture by adjusting the amount of the fuel re-injected to the cylinder side under control, and the explosion force is stably maintained to prevent the cylinder from being worn.

[MEANS FOR SOLVING THE PROBLEM]

In order to achieve the above object, according to the present invention, there is provided a fuel injection control method comprising the steps of: when a request for starting is detected in a cooled engine in an ignition reset mode, A first step of sequentially advancing the correction injection to the cylinder side of the engine and advancing to a mixer sucked through an ignition plug, and a second step of injecting a fuel amount calculated in accordance with the injection program set in the normal start of the engine after the first step A second step of executing fuel injection at a stoichiometric air-fuel ratio when the detected coolant temperature, the rotation speed of the crankshaft, and the voltage of the battery are determined to be maintained at a normal RPM; A third step of judging whether or not a request for restarting is detected from the switching means if it is not detected, A fourth step of calculating a remaining amount of fuel that is burned by the compression explosion of cranking after being injected into the cylinder in the start request of the front face state; and a fourth step of injecting the remaining fuel amount of the cylinder, which is calculated in the fourth step, And a fifth step of calculating the amount of fuel and correcting the amount of fuel to each cylinder.

According to another aspect of the present invention, there is provided a fuel injection control apparatus for controlling a fuel injection control apparatus, comprising: an ignition switch for outputting a predetermined signal corresponding to a selected contact according to an operation of an ignition key, A water temperature detecting means for detecting the temperature of the cooling water circulated through the cylinder block to absorb the heat of the engine and radiating the heat through the radiator core and outputting a predetermined signal; An engine operation detecting means for detecting an operation state of the engine based on a rotation speed of the crankshaft rotated by the rotation speed of the crankshaft and outputting a predetermined pulse signal corresponding thereto; When a request signal for restarting is detected due to the failure of the engine to start, Control means for calculating the amount of fuel consumed at startup and calculating the remaining amount of fuel to calculate the amount of fuel capable of performing normal ignition of the engine and detecting the voltage and current level to the battery, A voltage detection unit for detecting whether or not a normal explosion has occurred and outputting a signal corresponding to the detected normal explosion; and a control unit for controlling the amount of fuel calculated by opening and closing the nozzle at predetermined intervals, And an injector for injecting the fuel into the combustion chamber.

[Example]

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As can be seen from FIG. 1, the fuel injection quantity control apparatus for starting the engine according to the present invention includes a switching unit 10, a water temperature detection unit 20, an engine operation state detection unit 30, a control unit 40, The switching unit 10 selects a predetermined contact according to the operation of the ignition key and outputs a predetermined signal corresponding to the selected contact. The switching unit 10 switches the voltage of the battery through the selected contact, And supplies it to the means.

The water temperature detecting unit 20 detects the temperature of the cooling water circulated through the cylinder block to absorb the heat of the engine, radiates heat through the radiator core, and outputs a predetermined electrical signal corresponding thereto.

The engine operation detecting unit 30 detects the operation state of the engine through the rotation speed of the crankshaft rotated by the self-powered by the start motor or the explosion of the engine, and outputs a predetermined pulse signal corresponding thereto.

The control unit 40 controls the overall operation for the operation of the engine in accordance with the signals applied from the respective detection means. When the on-contact selection signal for starting the engine in the cooled state is detected from the switching unit 10, And the injection of the corrected fuel amount is controlled on the cylinder side in accordance with the stroke of the piston, and the start request of the first engine is restarted while the engine is not ignited The amount of remaining fuel is consumed at the start of the engine after the injection to the cylinder side according to the simultaneous injection and correction injection, and the amount of remaining fuel is controlled to control the amount of fuel injection so that the engine can be started normally.

The voltage detector 50 detects whether a start request of the engine or a normal explosion of the engine is detected through the level of voltage and current applied from the battery, and outputs a predetermined electrical signal corresponding thereto.

The injector 60 injects the calculated fuel amount to the cylinder side by opening and closing the nozzle at predetermined intervals in which the internal relay contacts are switched to the power source applied from the battery in accordance with the signal applied from the controller 40.

In the present invention having such functions, the operation of correcting the amount of injected fuel in response to the request for restarting the engine will be described with reference to FIG. 2 attached hereto.

The control unit 40 detects a signal applied from the switching unit 10 in a state where the engine is parked at an arbitrary position and the engine is cooled and the ignition mode maintains the reset (step 101). At this time, When the signal applied from the ignition switch 10 is detected by the selection of the ignition contact for starting the engine (step 102), the control unit 40 determines whether or not the predetermined amount of fuel is injected to the entire cylinder side A control signal is applied to the injector 60 side (step 103).

Accordingly, the injector 60 opens and closes for a predetermined period by a voltage applied from the battery in accordance with an applied control signal to inject a predetermined amount of fuel to the entire cylinder side, and the crankshaft Correct the amount of fuel sucked into each cylinder according to the angle.

At this time, high voltage of the ignition device is applied to the side of any cylinder which is compressed in accordance with the rotation of the crankshaft, and ignition for starting the engine is executed (step 104).

In the execution of step 104, the control unit 40 detects the rotational speed of the crankshaft applied from the engine operation detecting unit 30 and the state of the battery voltage and current applied from the voltage detecting unit 50, State is maintained (step 105).

When the normal explosion of the engine is detected in step 105, the temperature of the cooling water applied from the water temperature detector 20, the state of the battery voltage applied from the voltage detector 50, and the rotational speed of the crankshaft (Step 106), calculates the amount of fuel injected to each cylinder side, corrects the amount of fuel injected through the driving of the injector 60 (step 107), and detects each detected fuel amount (Step 108), the opening / closing cycle of the injector 60 is corrected (step 109) so that injection of fuel suitable for the stoichiometric air-fuel ratio is performed.

If it is determined in step 105 that the engine is not ignited in response to the start request, it is determined whether a request signal for restarting from the switching unit 10 is detected (step 111).

If a request for restarting is not detected in step 111, an overall operation for starting the engine is not performed. If a request for restarting is detected, the amount of fuel injected into the cylinder at the start request of the previous step After the amount of remaining fuel is subtracted and detected according to the set program (step 112), a correction amount for re-injection is calculated (step 113).

Then, when the control unit 40 applies a predetermined control signal to the injector 60 side to inject only the corrected fuel amount to each cylinder side, the injector 60 opens and closes the nozzle by the corresponding period, The fuel amount is corrected (step 114).

[effect]

As described above, according to the present invention, when a request for restarting is made in a state in which the engine is not ignited in the first attempt at the time of starting the engine that is cooled, the amount of fuel injected to the cylinder side and concentrated is calculated, The excessive amount of fuel is prevented from being excessively injected into the cylinder by the damping correction of the amount of fuel to prevent the exhaust gas from being excessively exhausted due to the incomplete combustion when the engine is turned on to maintain the concentration of the gas suitable for the exhaust control, Thereby improving the durability of the cylinder and the piston and suppressing the occurrence of knocking due to the elimination of the rich mixture, thereby providing stability in starting the engine.

Claims (2)

In the fuel injection control method, when a request for starting is detected in a cooled engine in the ignition reset mode, the calculated fuel amount is simultaneously injected into each cylinder, and the correction injection is sequentially progressed to a predetermined cylinder side, which is compressed by cranking A first step of performing ignition on a mixer sucked through an ignition plug at the same time as a first start of the engine and a second step of injecting a fuel amount calculated according to an injection program set in a normal start of the engine after the first step, A second step of executing fuel injection of a stoichiometric air-fuel ratio when the rotation speed of the shaft and the voltage of the battery are determined to be maintained at a normal RPM; and a second step of restarting the engine from the switching means if the normal ignition of the engine is not performed A third step of judging whether the engine is restarted or not; Calculating a fuel amount to be injected in response to a request for restarting from the cylinder remaining fuel amount calculated in the fourth step and calculating a fuel amount to be injected into each cylinder 5. The method of controlling an amount of fuel injected during engine starting according to claim 1, A switching means for selecting a predetermined contact according to the operation of the ignition key and outputting a predetermined signal corresponding to the selected contact and supplying the selected signal to the drive means side of the voltage of the battery through the selected contact point; A water temperature detecting means for detecting a temperature of cooling water circulated through the radiator core after absorbing the heat of the engine and outputting a predetermined signal, and a control means for controlling the temperature of the crankshaft An engine operation detecting means for detecting an operation state of the engine based on a rotation speed of the engine and outputting a predetermined pulse signal corresponding thereto; When a request signal for re-start is detected, it is sprayed on the cylinder side according to the simultaneous injection and correction injection, A control unit that calculates a fuel amount capable of performing normal ignition of the engine by calculating an amount of remaining fuel and controls a fuel amount injection; And a control unit for controlling the motor so that the fuel amount calculated by opening and closing the nozzle at predetermined intervals in which the internal relay contacts are switched to the power source applied from the battery in accordance with the signal of the control unit is injected to the cylinder side And an injector for injecting fuel into the engine.